Sprockets could be classified into conventional sprockets, HK sprockets and other sprockets.
1. Conventional sprocket
Standard sprockets are ANSI sprockets which may be engaged with regular series roller chains. See P125 for dimensions.
There are actually two kinds of tooth profiles: U-tooth and S-tooth.
two. HK sprocket
HK sprockets is often engaged with HK series roller chains, and those for single strand chains are identical to normal sprockets. Even so, sprockets for multiple strand chains are diverse from standard sprockets in sprocket tooth profile.
three. Other sprockets
Other sprockets are built according to your following calculation formulas to suit respective specialty chains.
The sprockets utilized for the following chains would be the same because the regular sprockets in tooth gap type, but diverse in tooth thickness (sprocket tooth profile).
4. Calculation of sprocket dimensions
The dimensions of typical sprockets and other common sprockets are calculated as follows. In the beginning, the diameters of sprockets are calculated in the following calculation formulas.
Following, 
sprocket tooth profile (the shape of the tooth dependant upon its thickness) is calculated from your following calculation formulas. (The values shown inside the following pages have been calculated by these formulas and thought to be the typical values.)
Calculation formulas for diameters and tooth gap types Calculation formulas for diameters
Calculation of pitch diameter, tip diameter and caliper diameter
The basic dimensions of a sprocket suitable for a chain pitch of one mm are respectively called pitch diameter aspect, tip diameter element and caliper diameter factor. The respective factors for respective numbers of teeth are listed beneath. If these elements are multiplied by chain pitch, the basic dimensions of the corresponding sprocket might be obtained.
Example:
From the situation of 80 (25.40 mm pitch) with 35 teeth Pitch diameter (Dp) ＝ P×Pitch diameter factor
Calculation formulas for tooth gap types
As the most rational tooth gap forms by which the stress angle modifications in response towards the elongation of a smoothly rotated roller chain with the lapse of services time, ANSI specify two forms of tooth profiles: U-type and S-type. Usually, S-type tooth profiles are adopted in accordance with ANSI, and our normal sprockets also have S-tooth profiles.
